<button class="button10">Button</button>

<style>
/* From Uiverse.io by NomNomcats  - Tags: simple, flashy, button, hover */
.button10 {
  display: inline-block;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  z-index: 1;
  color: #ffffff;
  padding: 0.8em 2em;
  cursor: pointer;
  font-size: 16px;
  border-radius: 0.5em;
  background: #000;
  border: 2px solid #00ffea;
  box-shadow: 0 0 20px rgba(0, 255, 234, 0.5);
}

.button10:active {
  color: #ffffff;
  box-shadow: inset 0 0 10px rgba(0, 255, 234, 0.7);
}

.button10:before,
.button10:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: rgba(0, 255, 234, 0.2);
  z-index: -1;
  transform: scale(0);
  transition: transform 0.5s;
  border-radius: inherit;
}

.button10:before {
  transition-delay: 0s;
}

.button10:after {
  transition-delay: 0.25s;
}

.button10:hover:before,
.button10:hover:after {
  transform: scale(1.2);
}

</style>
    